content: package com.alibaba.tesla.gateway.server.filter.global;
  
  import com.alibaba.fastjson.JSONObject;
  import com.alibaba.tesla.common.base.util.TeslaGsonUtil;
  import com.alibaba.tesla.gateway.server.domain.SwitchViewMapping;
  import com.alibaba.tesla.gateway.server.domain.SwitchViewUser;
  import com.alibaba.tesla.gateway.server.scheduler.SwitchViewScheduler;
  
  import lombok.extern.slf4j.Slf4j;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.cloud.gateway.filter.GatewayFilterChain;
  import org.springframework.cloud.gateway.filter.GlobalFilter;
  import org.springframework.core.Ordered;
  import org.springframework.http.HttpCookie;
  import org.springframework.http.server.reactive.ServerHttpRequest;
  import org.springframework.stereotype.Component;
  import org.springframework.util.Base64Utils;
  import org.springframework.util.StringUtils;
  import org.springframework.web.server.ServerWebExchange;
  import reactor.core.publisher.Mono;
  
  /**
   * @author qiuqiang.qq@alibaba-inc.com
   */
  @Slf4j
  @Component
  public class ViewSwitchGlobalFilter implements GlobalFilter, Ordered {
  
      private static final String HEADER_NAME_USER = "X-Auth-User";
  
      private static final String HEADER_NAME_EMP_ID = "X-EmpId";
  
      private static final String HEADER_NAME_USER_ID = "X-Auth-UserId";
  
      private static final String HEADER_NAME_BUC_ID = "X-Buc-Id";
  
      private static final String HEADER_NAME_FROM_EMP_ID = "X-From-EmpId";
  
      private static final String HEADER_NAME_FROM_USER = "X-From-Auth-User";
  
      private static final String HEADER_NAME_FROM_BUC_ID = "X-From-Buc-Id";
  
      private static final String COOKIE_NAME = "tesla_switch_view";
  
      @Autowired
      private SwitchViewScheduler switchViewScheduler;
  
      @Override
      public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
          if (exchange.getRequest().getCookies().containsKey(COOKIE_NAME) && null != exchange.getRequest().getCookies()
              .getFirst(COOKIE_NAME)) {
              HttpCookie cookie = exchange.getRequest().getCookies().getFirst(COOKIE_NAME);
              String empId = exchange.getRequest().getHeaders().getFirst(HEADER_NAME_EMP_ID);
              SwitchViewMapping mapping = TeslaGsonUtil.gson.fromJson(
                  new String(Base64Utils.decodeFromString(cookie.getValue())), SwitchViewMapping.class);
              SwitchViewUser switchUser = SwitchViewUser.builder()
                  .empId(empId)
                  .loginName(mapping.getFromLoginName())
                  .bucId(mapping.getFromBucId())
                  .build();
              if (switchViewScheduler.isInWhiteList(switchUser)) {
                  ServerHttpRequest request = exchange.getRequest().mutate()
                      .header(HEADER_NAME_EMP_ID, new String[] {mapping.getToEmpId()})
                      .header(HEADER_NAME_USER, new String[] {mapping.getToLoginName()})
                      .header(HEADER_NAME_USER_ID, new String[] {mapping.getToEmpId()})
                      .header(HEADER_NAME_BUC_ID, new String[] {mapping.getToBucId()})
                      .header(HEADER_NAME_FROM_EMP_ID, new String[] {mapping.getFromEmpId()})
                      .header(HEADER_NAME_FROM_USER, new String[] {mapping.getFromLoginName()})
                      .header(HEADER_NAME_FROM_BUC_ID, new String[] {mapping.getFromBucId()})
                      .build();
  
                  log.info("header={}", JSONObject.toJSONString(request.getHeaders()));
                  log.info("actionName=switchView||id={}||empId={}||viewUserId={}||viewUserName={}||viewBucId={}",
                      exchange.getRequest().getId(), empId, mapping.getToEmpId(), mapping.getToLoginName(),
                      mapping.getToBucId());
                  return chain.filter(exchange.mutate().request(request).build());
              } else {
                  log.warn("not in white list, empId={}", empId);
              }
          }
  
          return chain.filter(exchange);
      }
  
      @Override
      public int getOrder() {
          return GlobalFilterOrderManager.VIEW_SWITCH_FILTER;
      }
  }
  